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Patent Searching and Data

Document Type and Number:
Japanese Patent JP2001504048
Kind Code:
The invention concerns a method for making plastic tubes, whereby a tube blank (Te) brought to a temperature close to molecular orientation temperature is subjected to a bi-axial drawing, by radial expansion of the tube blank inside a forming shaft (2), with formation of a contraction cavity at one end of the tube, by controlled displacement of this contraction cavity to the other end of the tube, and by longitudinal drawing. The radial expansion is carried out in at least two phases, viz. a first phase during which the tube blank (Te) is inflated to an intermediate diameter (Di) determined by a double-walled envelope (21), introduced into the forming shaft (2), with circulation of a hot fluid between the two walls of the envelope (21), and then the envelope is gradually removed from the forming shaft (2) to enable, during a second phase, the radial expansion of the plastic tube up to an internal diameter of the forming shaft (2), and its longitudinal drawing.

Berner Perbota
Jean-Jack Ake
Application Number:
Publication Date:
March 27, 2001
Filing Date:
September 18, 1997
Export Citation:
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Society Alpha Can
International Classes:
B29C49/08; B29C49/14; B29C49/48; B29C55/26; B29C57/08; F16L47/06; F16L47/08; (IPC1-7): B29C49/48; B29C55/26; F16L47/06
Attorney, Agent or Firm:
Takashi Koshiba